I don't have fish in my pond (just frogs), but I plan to buy a de-icer to help the frogs and to try to over-winter water lilies. The temperature in my area (Northern Virginia) usually doesn't go below 20 degrees. The pond is a pre-formed one that is 7 ft. long, 4 ft. wide and 18" deep. Could someone recommend a suitable wattage for the de-icer? Thanks.
Thanks to all of you for very helpful information. As you can tell, I'm new at pond-keeping, but after seeing all of our plants die and finding a dead frog in the pond this past spring, I'm going to try to do better this year. I'm going to order a de-icer right now while I'm thinking about it. I'm in Zone 6, although over the last few years our climate has been moving towards the Zone 7 range. Thanks for the link to skippysstuff, Spitzkopf; that was interesting.
Yes, thanks from me too on the skippy stuff. I like the aerator idea. We pumped water through the pond last year but lost all large fish. We figured it was too much water movement while the fish were dormant and it somehow kept them agitated? Just don't know. We had very little ice, maybe 6" which left a good amount of water and had three open holes going in the ice to release gases.